usermeta 10 millions entries

Hi,

First, thanks for these great plugins wpmudev :slight_smile:
I installed Multi-DB without problems, i use 4096 databases but the problem is scalability of "wp-usermeta" table! With 1 million members, this table will contain 10 millions entries -> this will slow(shut) down mysql server.

Did anyone have a solution or suggestion ? Why Multi-DB dont use multi tables or databases for wp_usermeta like member's tables (ex:wp_1000000_)

Thanks!